An oil-immersed power transformer

Abstract

The utility model discloses an oil immersed power transformer, one side is provided with high pressure protective cover shell for the coverage of high voltage side wiring unit, and the high voltage electrified part is physically isolated with outside environment, and the insulation reliability is greatly improved, on the other hand, the low voltage side wiring unit adopts the positioning column to pass through the mounting seat and the positioning edge, and then locks with the fastener, and the structure ensures the accurate centering between the wiring shaft sleeve and the transformer terminal post, avoids the contact area reduction caused by the installation deviation, the large area of the positioning edge and the mounting seat is attached, and the locking force of the fastener is matched, can evenly and stably transmit the pressure to the internal electric connection component, ensures that it keeps enough and constant contact pressure with the terminal post, thereby obtains the minimum and stable contact resistance, guarantees the current -carrying capacity of low voltage side wiring unit, can satisfy the demand of large current transmission, is especially suitable for installing the transformer in the outdoor vibration environment, and prevents the power failure caused by the joint loosening.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, specifically to an oil-immersed power transformer. Background Technology

[0002] Oil-immersed transformers are a type of transformer where the coils are immersed in oil. Due to fire safety requirements, oil-immersed transformers are typically installed in a separate transformer room or outdoors. They are characterized by their large size, low cost, simple maintenance, good heat dissipation, strong overload capacity, and wide environmental adaptability.

[0003] When a transformer is put into operation, high-voltage and low-voltage side connections need to be made. The high-voltage side is characterized by extremely high voltage, and its core challenges are insulation and safety. The low-voltage side is characterized by extremely high current, and its core challenges are current-carrying capacity and connection reliability. Currently, existing oil-immersed power transformers used outdoors suffer from inadequate safety protection on the high-voltage side and unstable low-voltage side connections, making them prone to safety accidents or power supply anomalies during operation.

[0004] In view of this, there is an urgent need to design an oil-immersed power transformer to solve the technical defects of existing transformers. Utility Model Content

[0005] To address the aforementioned problems, this utility model provides an oil-immersed power transformer, comprising a transformer body, a high-voltage side wiring unit and a low-voltage side wiring unit, and a high-voltage protective cover connected to the transformer body. The high-voltage side wiring units are all located within the high-voltage protective cover, and a high-voltage wiring window is provided on the side of the high-voltage protective cover. Each low-voltage side wiring unit includes a terminal, a mounting base, and a wiring sleeve. The terminal is fixedly connected to the transformer body and electrically connected to the windings inside the transformer body. A positioning post is provided on the outer periphery of the terminal and is connected to the transformer body. The mounting base is connected to the positioning post. The wiring sleeve includes a sleeve body and an electrical connection component located inside the sleeve body. One end of the sleeve body extends outward to form a positioning edge, and the other end of the sleeve body is provided with a cable electrically connected to the electrical connection component. The positioning edge is abutted against the mounting base. The positioning post passes sequentially through the mounting base and the positioning edge. A fastener is connected to the positioning post, and the fastener is located on the side of the positioning edge away from the mounting base.

[0006] In one possible implementation, the electrical connection assembly includes parallel positioning fasteners, with annularly arranged conductive contacts connected to the outer periphery of the positioning fasteners. The outer edge of the positioning fasteners has a positioning slot, and the conductive contacts are connected within the positioning slot. An annular spring is sleeved around the outer periphery of the conductive contacts, and an electrical contact surface is provided on the inward-facing side of the conductive contacts.

[0007] In one possible implementation, the cable is electrically connected to the conductive contact via a soft copper wire.

[0008] In one possible implementation, the terminal block includes a terminal frustum and a conductive column located at the center of the terminal frustum, with a shock-absorbing element provided between the terminal frustum and the mounting base.

[0009] In one possible implementation, the shock absorber has a first connection hole, the positioning edge has a second connection hole, the mounting base has a clearance opening, the inner edge of the clearance opening has an inner groove, and the positioning post passes through the first connection hole, the inner groove and the second connection hole in sequence to connect with the fastener.

[0010] In one possible implementation, the shock absorber includes an upper crimping end face and a lower crimping end face. The upper crimping end face has a protrusion, and the lower crimping end face has a side stop. The mounting base is fitted to the upper crimping end face, the protrusion of the mounting base abuts against the inner edge of the relief opening, the lower crimping end face is fitted to the upper end face of the wiring frustum, and the side stop abuts against the side of the wiring frustum.

[0011] In one possible implementation, the shock absorber is made of silicone rubber or polytetrafluoroethylene.

[0012] In one possible implementation, the fastener is a nut, and a washer is provided between the fastener and the mounting base.

[0013] In one possible implementation, a top plate is connected to the transformer body, and the positioning post is connected to the top plate.

[0014] In one possible implementation, the high-voltage side wiring unit is provided in three sets, and the low-voltage side wiring unit is provided in four sets.

[0015] Compared with the prior art, the technical solution provided by this utility model has the following advantages: This technical solution involves an oil-immersed power transformer equipped with a high-voltage protective enclosure to cover the high-voltage side connection unit, forming a semi-enclosed barrier in the area where the high-voltage side boundary unit is located, physically isolating the high-voltage live parts from the external environment. This effectively prevents creepage, flashover, and even short-circuit accidents caused by dirt, condensation, or foreign object contact, greatly improving insulation reliability.

[0016] This technical solution for the low-voltage side connection unit of the oil-immersed power transformer uses a positioning post that passes through the mounting base and positioning edge, and is then locked with fasteners. This structure ensures precise alignment between the connecting shaft sleeve and the transformer terminal, avoiding reduced contact area due to installation deviation. The large-area contact between the positioning edge and the mounting base, combined with the locking force of the fasteners, can transmit pressure evenly and stably to the internal electrical connection components, ensuring sufficient and constant contact pressure with the terminal, thereby obtaining minimal and stable contact resistance. This guarantees the current-carrying capacity of the low-voltage side connection unit and can meet the needs of high current transmission. It is particularly suitable for transformers installed outdoors in environments prone to vibration, and eliminates power outages caused by loose connections. Attached Figure Description

[0017] Figure 1 This is a perspective view of an oil-immersed power transformer according to an embodiment of the present invention.

[0018] Figure 2 This is another perspective view of an oil-immersed power transformer according to an embodiment of the present invention.

[0019] Figure 3 This is a schematic diagram of the low-voltage side wiring unit in an embodiment of this utility model.

[0020] Figure 4 This is an exploded view of the low-voltage side wiring unit of an embodiment of this utility model.

[0021] Figure 5 This is a cross-sectional view of the wiring shaft sleeve in an embodiment of this utility model.

[0022] Figure 6 This is a perspective view of the electrical connection assembly according to an embodiment of the present utility model.

[0023] Figure 7 This is a perspective view of the shock-absorbing component in an embodiment of this utility model.

[0024] Figure 8 This is another perspective view of the shock-absorbing component according to an embodiment of the present utility model. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. The accompanying drawings are for illustrative purposes only, representing schematic diagrams only, not actual object drawings, and should not be construed as limiting this patent. To better illustrate the embodiments of this utility model, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0026] Combined with appendix Figure 1 To be continued Figure 8 This utility model provides an oil-immersed power transformer, comprising a transformer body 1, a high-voltage side wiring unit 2 and a low-voltage side wiring unit 3, and a high-voltage protective cover 4 connected to the transformer body 1. The high-voltage side wiring units 2 are all located within the high-voltage protective cover 4, and a high-voltage wiring window 41 is provided on the side of the high-voltage protective cover 4. The low-voltage side wiring unit 3 includes a terminal block 31, a mounting base 2, and a wiring sleeve. The terminal block 31 is fixedly connected to the transformer body 1 and electrically connected to the windings inside the transformer body 1. A positioning post 12 is provided on the outer periphery of the terminal block 31, and the positioning post 2 is connected to... On the transformer body 1, the mounting base 32 is connected to the positioning post 12. The wiring bushing includes a bushing body 33 and an electrical connection component 34 located inside the bushing body 33. One end of the bushing body 33 extends outward to form a positioning edge 331. The other end of the bushing body 33 is provided with a cable 35 electrically connected to the electrical connection component 34. The positioning edge 331 is in contact with the mounting base 32. The positioning post 12 passes through the mounting base 32 and the positioning edge 331 in sequence. A fastener 36 is connected to the positioning post 12. The fastener 36 is located on the side of the positioning edge 331 away from the mounting base 32.

[0027] In this embodiment, the oil-immersed power transformer is equipped with a high-voltage protective cover 4 to cover the high-voltage side wiring unit 2, forming a semi-enclosed barrier in the area where the high-voltage side boundary unit 2 is located, physically isolating the high-voltage live parts from the external environment. This can effectively prevent creepage, flashover, or even short-circuit accidents caused by dirt, condensation, foreign object contact, etc., and greatly improve the insulation reliability.

[0028] In this embodiment, the low-voltage side wiring unit 3 of the oil-immersed power transformer uses a positioning post 12 that passes through the mounting base 32 and the positioning edge 331, and is then locked with a fastener 36. This structure ensures precise alignment between the wiring sleeve 33 and the transformer terminal 31, avoiding reduced contact area due to installation deviation. The large-area contact between the positioning edge 331 and the mounting base 32, combined with the locking force of the fastener 36, can transmit pressure evenly and stably to the internal electrical connection component 34, ensuring that it maintains sufficient and constant contact pressure with the terminal 31, thereby obtaining minimal and stable contact resistance. This ensures the current-carrying capacity of the low-voltage side wiring unit 3 and meets the requirements of high current transmission. It is particularly suitable for transformers installed outdoors in environments prone to vibration, and prevents power outages caused by loose connections.

[0029] In this embodiment, as shown in the appendix Figure 5 and attached Figure 6 As shown, the electrical connection assembly 34 includes parallel positioning fasteners 341, with annularly arranged conductive contacts 342 connected to the outer periphery of the positioning fasteners 341. A positioning groove 343 is provided on the outer edge of the positioning fasteners 341, and the conductive contacts 342 are connected in the positioning groove 343. An annular spring 344 is sleeved on the outer periphery of the conductive contacts 342, and an electrical contact surface 345 is provided on the inward side of the conductive contacts 342.

[0030] In this embodiment, when the electrical connection assembly 34 is connected to the terminal 31, the conductive contact 342 is tightened inward under the action of the annular spring 344, and the electrical contact surface 345 is in close contact with the terminal 31, so that the two form a typical connection with a large contact area.

[0031] In this embodiment, the cable 35 is electrically connected to the conductive contact 342 via a soft copper wire, which is not shown in the accompanying drawings.

[0032] In this embodiment, as shown in the appendix Figure 4 As shown, the terminal block 31 includes a terminal frustum 311 and a conductive post 312 located at the center of the terminal frustum 311. A shock-absorbing component 37 is provided between the terminal frustum 311 and the mounting base 32.

[0033] In this embodiment, as shown in the appendix Figure 3 Appendix Figure 4 Appendix Figure 7 and attached Figure 8As shown, the shock absorber 37 has a first connection hole 371, the positioning edge 331 has a second connection hole 332, the mounting base 32 has a clearance opening 321, and the inner edge of the clearance opening 321 has an inner groove 322. The positioning post 12 passes through the first connection hole 371, the inner groove 322 and the second connection hole 332 in sequence and is connected to the fastener 36.

[0034] In this embodiment, as shown in the appendix Figure 7 and attached Figure 8 As shown, the shock absorber 37 includes an upper crimping end face 372 and a lower crimping end face 373. The upper crimping end face 372 has a protrusion 374, and the lower crimping end face 373 has a side stop 375. The mounting base 32 is fitted to the upper crimping end face 372, the protrusion of the mounting base 32 abuts against the inner edge of the relief opening 321, the lower crimping end face 373 is fitted to the upper end face of the wiring frustum 311, and the side stop 375 abuts against the side of the wiring frustum 311. This shock absorber 37 ensures the shock absorption performance of the low-voltage side wiring unit during use, thereby improving the reliability of the electrical connection.

[0035] In this embodiment, the shock absorber 37 is made of silicone rubber or polytetrafluoroethylene. The shock absorber 37 made of the above materials is resistant to high pressure and high temperature.

[0036] In this embodiment, the fastener 36 is a nut, and a washer 38 is provided between the fastener 36 and the mounting base 32 to further improve the shock resistance.

[0037] In this embodiment, a top plate 11 is connected to the transformer body 1, and the positioning column 12 is connected to the top plate 11.

[0038] In this embodiment, the high-voltage side wiring unit 2 is provided with three sets, and the low-voltage side wiring unit 3 is provided with four sets, to meet the actual three-phase four-wire wiring requirements.

[0039] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model, or direct / indirect applications in other related technical fields, should be included within the scope of protection of the claims of this utility model.

Claims

1. An oil-immersed power transformer, comprising a transformer body, wherein the transformer body includes a high-voltage side connection unit and a low-voltage side connection unit, characterized in that, A high-voltage protective cover is connected to the transformer body. All high-voltage side wiring units are located inside the high-voltage protective cover. A high-voltage wiring window is provided on the side of the high-voltage protective cover. The low-voltage side wiring unit includes a terminal, a mounting base, and a wiring sleeve. The terminal is fixedly connected to the transformer body and electrically connected to the winding inside the transformer body. A positioning post is provided on the outer periphery of the terminal and is connected to the transformer body. The mounting base is connected to the positioning post. The wiring sleeve includes a sleeve body and an electrical connection component located inside the sleeve body. One end of the sleeve body extends outward to form a positioning edge. The other end of the sleeve body is provided with a cable electrically connected to the electrical connection component. The positioning edge fits against the mounting base. The positioning post passes through the mounting base and the positioning edge in sequence. A fastener is connected to the positioning post. The fastener is located on the side of the positioning edge away from the mounting base.

2. The oil-immersed power transformer according to claim 1, characterized in that, The electrical connection assembly includes parallel positioning buckles, with annularly arranged conductive contacts connected to the outer periphery of the positioning buckles. A positioning groove is formed on the outer edge of the positioning buckles, and the conductive contacts are connected to the positioning groove. An annular spring is sleeved on the outer periphery of the conductive contacts, and an electrical contact surface is provided on the inward-facing side of the conductive contacts.

3. The oil-immersed power transformer according to claim 2, characterized in that, The cable is electrically connected to the conductive contact via a soft copper wire.

4. The oil-immersed power transformer according to claim 1, characterized in that, The terminal block includes a terminal frustum and a conductive column located at the center of the terminal frustum, and a shock-absorbing component is provided between the terminal frustum and the mounting base.

5. An oil-immersed power transformer according to claim 4, characterized in that, The shock absorber has a first connection hole, the positioning edge has a second connection hole, the mounting base has a clearance opening, the inner edge of the clearance opening has an inner groove, and the positioning post passes through the first connection hole, the inner groove and the second connection hole in sequence to connect with the fastener.

6. An oil-immersed power transformer according to claim 5, characterized in that, The shock absorber includes an upper pressing end face and a lower pressing end face. The upper pressing end face is provided with a protrusion, and the lower pressing end face is provided with a side stop. The mounting seat is attached to the upper pressing end face, the protrusion of the mounting seat abuts against the inner edge of the relief opening, the lower pressing end face is attached to the upper end face of the wiring frustum, and the side stop abuts against the side of the wiring frustum.

7. An oil-immersed power transformer according to any one of claims 4 to 6, characterized in that, The shock-absorbing components are made of silicone rubber or polytetrafluoroethylene.

8. An oil-immersed power transformer according to any one of claims 1 to 6, characterized in that, The fastener is a nut, and a washer is provided between the fastener and the mounting base.

9. An oil-immersed power transformer according to any one of claims 1 to 6, characterized in that, A top plate is connected to the transformer body, and the positioning column is connected to the top plate.

10. An oil-immersed power transformer according to any one of claims 1 to 6, characterized in that, The high-voltage side wiring unit is provided in three sets, and the low-voltage side wiring unit is provided in four sets.

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